The GH axis & GHSR

The control system ipamorelin plugs into

Growth hormone is not released on command at a constant rate. The axis is conventionally drawn as a tug-of-war between two hypothalamic signals, a release signal and a brake, and what is actually measured is the output: 24-hour sampling in normal men counted about 12 discrete secretory bursts a day, separated by deep troughs. Ipamorelin works by pressing on a third, parallel input to that system.

This unit walks the growth-hormone axis from the top down: the receptor ipamorelin binds, the signaling cascade inside the pituitary cell, why the pulsatile pattern matters, and where this receptor is found in the body beyond the pituitary.